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Convertible Senior Notes - Conversion (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Mar. 08, 2018
Sep. 30, 2019
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Convertible Senior Notes          
Debt Instrument, Face Amount     $ 100,000    
Less cost of related capped call and common stock forward         $ (43,500)
Proceeds from Issuance of Debt       $ 39,052 $ 95,856
Convertible Senior Notes          
Convertible Senior Notes          
Debt Instrument, Face Amount   $ 40,000 100,000    
$40M Convertible Senior Note          
Convertible Senior Notes          
Debt Instrument, Face Amount   40,000   48,000  
Less initial purchasers' discount   (8,000)      
Proceeds from Issuance of Debt   $ 39,100      
$100M Convertible Senior Notes          
Convertible Senior Notes          
Debt Instrument, Face Amount $ 100,000   100,000 100,000  
Less initial purchasers' discount (3,250)        
Less initial purchasers' discount (3,300)        
Less cost of related capped call and common stock forward (43,500)   (43,500)    
Less other issuance costs (894)     $ (1,700)  
Proceeds from Issuance of Debt $ 52,356   $ 95,900